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Is it acceptable to declare/define a variable in a C header?
A global variable that must be accessed from more than one file can and should be declared in a header file. In addition, such a variable must be defined in one source file. Variables should not be defined in header files, because the header file can be included in multiple source files, which would cause multiple definitions of the variable. The ANSI C standard will allow multiple external definitions,...
nsivaramprasad
- Nov 28th, 2005
A variable can be declare/define in a C Header without any kind of compilational/ logical errors. But it is against the coding specifications and it is not normally practiced. If proper Multiple inclu...
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}
">X) main(){ printf("%x",-1
fff0Explanation :-1 is internally represented as all 1's. When left shifted four times the least significant 4 bits are filled with 0's.The %x format specifier specifies that the integer value be printed as a hexadecimal value
xeejam
- Nov 11th, 2005
Depending on the machine implementation it will result in FFFFFF0 (for 32bit ) or FFF0 (16 bit )
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case 1: printf("one");
break;
case 2:printf("two");
break;
case 3: printf("three");
break;
}
}
">Ix) main(){ int i=3; switch(i) { default:printf("zero"); case 1: printf("one"); break; case 2:printf("two"); break; case 3: printf("three"); break; } }
threeExplanation :The default case can be placed anywhere inside the loop. It is executed only when all other cases doesn't match.
Lakshmi Prabha
- Oct 22nd, 2005
The output will be three because when execution takes place ,inside the switch the corresponding case 3(since i=3)is selected and as there is a break statement after it, it cmes out of the loop.
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Point out the error in the following program main() { const int x; x=128; printf("%d",x); }
x should have been initialized where it is declared.
shrutimitra
- Oct 23rd, 2005
We can not assign a value to a const variables. we can only initialize it while creating or declearing the variable.
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If the following program (myprog) is run from the command line as myprog monday tuesday wednesday thursday, What would be the output? main(int argc, char *argv[]) { while(--argc >0) printf("%s",*++argv); } a) myprog monday tuesday wednesday thursday b) monday tuesday wednesday thursday c) myprog tuesday thursday d) None of the above
shrutimitra
- Oct 23rd, 2005
B) monday tuesday wednesday thursday. Because in while loop we have (--argc) which will ensure that the loop will run for 4 times. if we want to print value of (*++argv) ,it will skip the first value of argv array.
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In the following code; #include<stdio.h> main() { FILE *fp; fp= fopen("trial","r"); } fp points to: a) The first character in the file. b) A structure which contains a "char" pointer which points to the first character in the file. c) The name of the file. d) None of the above.
shrutimitra
- Oct 23rd, 2005
B) A structure which contains a "char" pointer which points to the first character in the file.
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What is the difference between goto and longjmp() and setjmp()?
A goto statement implements a local jump of program execution, and the longjmp() and setjmp() functions implement a nonlocal, or far, jump of program execution. Generally, a jump in execution of any kind should be avoided because it is not considered good programming practice to use such statements as goto and longjmp in your program. A goto statement simply bypasses code in your program and jumps...
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What is #line used for?
The #line preprocessor directive is used to reset the values of the _ _LINE_ _ and _ _FILE_ _ symbols, respectively. This directive is commonly used in fourth-generation languages that generate C language source files.
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How many levels deep can include files be nested?
Even though there is no limit to the number of levels of nested include files you can have, your compiler might run out of stack space while trying to include an inordinately high number of files. This number varies according to your hardware configuration and possibly your compiler.
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C Interview Questions
Ans